Implement AES-GCM in tlslite.

third_party/tlslite/tlslite/utils/tripledes.py

 # Author: Trevor Perrin
 # See the LICENSE file for legal information regarding use of this file.
 
 """Abstract class for 3DES."""
 
 class TripleDES(object):
     def __init__(self, key, mode, IV, implementation):
         if len(key) != 24:
             raise ValueError()
         if mode != 2:
             raise ValueError()
         if len(IV) != 8:
             raise ValueError()
         self.isBlockCipher = True
+        self.isAEAD = False
         self.block_size = 8
         self.implementation = implementation
         self.name = "3des"
 
     #CBC-Mode encryption, returns ciphertext
     #WARNING: *MAY* modify the input as well
     def encrypt(self, plaintext):
         assert(len(plaintext) % 8 == 0)
 
     #CBC-Mode decryption, returns plaintext
     #WARNING: *MAY* modify the input as well
     def decrypt(self, ciphertext):
         assert(len(ciphertext) % 8 == 0)